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Both kwashiorkor (edematous PCM) and marasmus (nonedematous PCM) are common in underdeveloped countries and in areas in which dietary amino acid content is insufficient to satisfy growth requirements. Kwashiorkor typically occurs at about age 1, after infants are weaned from breast milk to a protein-deficient diet of starchy gruels or sugar water, but it can develop at any time during the formative years. Marasmus affects infants ages 6 to 18 months as a result of breast-feeding failure, or a debilitating condition such as chronic diarrhea.
In industrialized countries, PCM may occur secondary to chronic metabolic disease that decreases protein and calorie intake or absorption, or trauma that increases protein and calorie requirements. In the United States, PCM is estimated to occur to some extent in 50% of elderly people in nursing homes. Those who aren’t allowed anything by mouth for an extended period are at high risk of developing PCM. Conditions that increase protein-calorie requirements include severe burns and injuries, systemic infections, and cancer (accounts for the largest group of hospitalized patients with PCM). Conditions that cause defective utilization of nutrients include malabsorption syndrome, short-bowel syndrome, and Crohn’s disease.
Source: Professional Guide to Diseases (Eighth Edition), 2005
The term 'prevalence' of Marasmus usually refers to the estimated population of people who are managing Marasmus at any given time. The term 'incidence' of Marasmus refers to the annual diagnosis rate, or the number of new cases of Marasmus diagnosed each year. Hence, these two statistics types can differ: a short-lived disease like flu can have high annual incidence but low prevalence, but a life-long disease like diabetes has a low annual incidence but high prevalence. For more information see about prevalence and incidence statistics.
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